one of the americans responding to the emergency is julia nesheiwat. she's a state department official who was already in japan working on nuclear issues. she served, in washington, as deputy chief of staff to the director of national intelligence. in tokyo, she's been on the fukushima disaster from the start. we're providing the full resources of the united states government, everything we've got? >> nesheiwat: yes. absolutely. >> pelley: our best people are on this? >> nesheiwat: yes. they are working non-stop around the clock in each of the operations centers. >> pelley: they are now working side by side with the japanese? >> nesheiwat: yes. >> pelley: but that wasn't always the case. >> nesheiwat: not in the beginning, no. >> pelley: an american team of top experts arrived shortly after the disaster, but they were largely stuck at the u.s. embassy. the japanese didn't think they needed the help, but, by last tuesday, the emergency was out of control and the u.s. gave the japanese an ominous private warning. >> nesheiwat: that if we don't expand the